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timrobertson100
 Post subject: Intersect Workaround
PostPosted: Sun Jan 01, 2006 1:19 pm 
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I'm using hibernate 3 on mysql 5 to model a many to one of Multimedia to Tag.

I started with a search for Multimedia with any of the given tags - e.g.:
Code:
from Multimedia m where m.tags.tagValue in ('Tim', 'Sweden')


I would like to search for Multimedia with all of the given tags - e.g.:
Code:
from Multimedia m where m.tags.tagValue = 'Sweden' and m.tags.tagValue = 'Tim'


Obviously this is not good hql as the number of search tags is unknown. Given that there is no interect, can someone please suggest cleaner hql for this? I know I'm missing something simple...

Many thanks
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rimmele7
 Post subject:
PostPosted: Sun Jan 01, 2006 3:42 pm 
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Joined: Sun Dec 28, 2003 4:35 pm
Posts: 13
You could use a Criteria Query.

Chapter 15. Criteria Queries

Greetings, Thomas
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timrobertson100
 Post subject:
PostPosted: Sun Jan 01, 2006 4:32 pm 
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Thanks mate - don't know what the hell I was thinking for not using them! Credits are yours...
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timrobertson100
 Post subject:
PostPosted: Mon Jan 02, 2006 5:08 am 
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Just looked at the criteria stuff - it's still going to have to have a loop to add

Code:
session.createCriteria(Multimedia.class)
  // for each tag loop doing
  .createCriteria("tags")
    .add( Restrictions.eq("tagValue", %LOOP_VALUE%) )


Is there a way to do this without looping?
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timrobertson100
 Post subject:
PostPosted: Mon Jan 02, 2006 6:57 am 
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Fixed now:

I didn't think "allEq" would work with a map with multiple values of the same key but it does

Code:
      Map tagsMap = new HashMap();
      tagsMap.put("tagValue","Sweden");
      tagsMap.put("tagValue","Tim");
      return getSession()
            .createCriteria(Multimedia.class)
               .createCriteria("tags")
                  .add(Restrictions.allEq(tagsMap))
            .list();
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timrobertson100
 Post subject:
PostPosted: Tue Jan 03, 2006 7:53 am 
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Seamingly this doesn't work after all and can return ID's 1,2,1,2.
I could add a results transformer but don't want to as it'll screw up pagination.

Can anyone suggest some HQL to do what was posted in the original message?
Thanks
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